Now a damning accusation by a U.S. Department of Housing and Urban Development’s inspector general has been filed as an exhibit in that lawsuit. The report says that Bank of America "significantly hindered" a federal review of its foreclosure practices.

“Our review was significantly hindered by Bank of America’s reluctance to allow us to interview employees or provide data and information in a timely manner,” said William Nixon, an assistant regional inspector general for HUD.

The inspector general for HUD has been investigating Bank of America’s foreclosure practices on what may be billions of dollars worth of taxpayer-backed loans. From October 2008 to September 2010, Bank of America submitted 40,219 claims on loans backed by Federal Housing Authority. The bank said it was owed $5.7 billion in taxpayer cash.

Nixon’s team was assigned to investigate the bank’s claims.

News of the confidential investigation into FHA claims was first broken by Shahein Nasiripour of the Huffington Post way back in May.